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annotate mod_s2s_auth_dnssec_srv/mod_s2s_auth_dnssec_srv.lua @ 1363:478b3288192f

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mod_s2s_auth_dnssec_srv: Fix tb when no hostname sent by remote
author Kim Alvefur <zash@zash.se>
date Wed, 19 Mar 2014 19:51:57 +0100
parents b9213ddb860f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2b2d4b1de638 mod_s2s_auth_dnssec_srv: Implements Secure Delegation using DNS SRV
Kim Alvefur <zash@zash.se>
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1 -- Copyright (C) 2013 Kim Alvefur
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2 -- This file is MIT/X11 licensed.
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3 --
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Florian Zeitz <florob@babelmonkeys.de>
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4 -- Implements Secure Delegation using DNS SRV as described in
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5 -- http://tools.ietf.org/html/draft-miller-xmpp-dnssec-prooftype
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6 --
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7 -- Dependecies:
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8 -- Prosody above hg:43059357b2f0
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9 -- DNSSEC-validating DNS resolver
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10 -- https://github.com/Zash/luaunbound
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11 -- libunbound binding using LuaJIT FFI
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12
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13 module:set_global();
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14
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15 local nameprep = require"util.encodings".stringprep.nameprep;
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16 local to_unicode = require"util.encodings".idna.to_unicode;
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17 local to_ascii = require "util.encodings".idna.to_ascii;
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18 local cert_verify_identity = require "util.x509".verify_identity;
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19 local dns_lookup = require"net.adns".lookup;
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20 local t_insert = table.insert;
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22 module:hook("s2s-check-certificate", function(event)
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23 local session, cert = event.session, event.cert;
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24
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25 if session.cert_chain_status == "valid" and session.cert_identity_status ~= "valid"
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26 and session.srv_hosts.answer and session.srv_hosts.answer.secure then
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27 local srv_hosts, srv_choice, srv_target = session.srv_hosts, session.srv_choice;
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28 for i = srv_choice or 1, srv_choice or #srv_hosts do
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29 srv_target = nameprep(to_unicode(session.srv_hosts[i].target:gsub("%.?$","")));
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30 (session.log or module._log)("debug", "Comparing certificate with Secure SRV target %s", srv_target);
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31 if srv_target and cert_verify_identity(srv_target, "xmpp-server", cert) then
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32 (session.log or module._log)("info", "Certificate matches Secure SRV target %s", srv_target);
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33 session.cert_identity_status = "valid";
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34 return;
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35 end
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36 end
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37 end
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38 end);
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39
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40 function module.add_host(module)
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41 module:hook("s2s-stream-features", function(event)
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42 local host_session = event.origin;
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43 local name = host_session.from_host and to_ascii(host_session.from_host);
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44 if not name then return end
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45 dns_lookup(function (answer)
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46 if host_session.dane ~= nil then return end
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47 if not answer.secure or #answer == 1
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48 and answer[1].srv.target == "." then return end
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49 local srv_hosts = { answer = answer };
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50 for _, record in ipairs(answer) do
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51 t_insert(srv_hosts, record.srv);
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52 end
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53 host_session.srv_hosts = srv_hosts;
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54 end, "_xmpp-server._tcp."..name..".", "SRV");
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55 end);
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56 end
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57